Grade 12.9 high-strength US Imperial fine thread screws, available in 5/16-24 UNF and 3/8-24 sizes, feature a cylinder (cup) head and hex socket drive. Engineered for heavy-duty industrial fastening, these screws deliver exceptional tensile strength and wear resistance, ideal for high-load applications. The UNF fine thread design ensures precise engagement and stability, making them suitable for machinery, automotive components, precision equipment, and industrial assemblies that require tight tolerance and reliable performance with US-spec fasteners.
Core Features & Advantages
Grade 12.9 High Strength: Crafted from premium alloy steel, Grade 12.9 offers superior tensile strength (≥1200MPa) and hardness, withstands heavy loads and mechanical stress, outperforming lower-grade screws in industrial high-demand scenarios.
US Imperial Fine Thread Specifications: Available in 5/16-24 UNF and 3/8-24 fine thread sizes, ensuring compatibility with US-standard components. Fine threads provide enhanced holding power and precise adjustment for tight-tolerance assemblies.
Cylinder Head Hex Socket Design: Cylinder (cup) head offers stable load distribution and a clean finish, while the hex socket drive enables precise tightening in confined spaces, reducing slippage and drive damage, compatible with standard industrial hex tools.
Industrial-Grade Durability: Heat-treated alloy steel construction ensures wear and impact resistance, maintaining structural integrity in long-term heavy-duty use, suitable for automotive, machinery, and precision equipment.
Versatile Size Coverage: Dual sizes (5/16-24 UNF, 3/8-24) cater to diverse fastening needs, from medium to heavy-duty industrial components, fitting US-spec assembly requirements.
